Manufacture of lustrous threads of cellulose.



- Lustrous followingis a specification. 7

UNITED STATES PATENT FFICE;

RUDOLF LINKMEYER, or BRUSSELS,BELGIUM; I

MANUFACTURE OF LUSTROUS THREADS OF OEL L ULOSE.

Be it known that I, RUDOLF LINKMEYER, a subject of the German Emperor,residing at Brussels, Belgium, have invented new and useful Im rovementsin the. Manufacture. of

lhreads of Cellulose,

This ap lication is a divisionof the applic'ationfile March 29, 1905,SerialNo. 252 633.

After the unc'ombined ammonia has een 'withdrawn oreliminated from acuproammoniacal solution of cellulose silk-like threads ,tion ofsulfuric acid.

The object of the present-invention is to obtain threads of far greaterbrilliancy by treat' the same immediately after their formation indiluteacid by means of' a reagent havingthe property of mercerizingsuch, forexample, as caustic-soda or potash solutions.

into an acid I not capable of combininginstantly with the By way ofexample, the following method of operat' may be 'ven: -A cuproammoniacal solution of co ulose from whlch free ammonia has beenwithdrawn or eliminatedis caused to ass through small apertures uted toan a degree that it is salts of the cupric solution-for exam le,sulfuric acid at two to fifteen per cent;

a lye of hydrate of soda 'or of potash, more or less concentratedsayfrom 10 to 40 Baum+a somewhat strong ,,s'olution being f I mostsuitable. Then after rinsing in water,

Specification of Letters ram;

of which the en a the threads obtained are passed directly into rateuted Dec. 18, ieoe.

Divided andthll application fllod latch 22, 1906. Serial Ho. 807,404-

' so as to free them from the caustic solution whlch still adheresthereto, the are treated 40 in a solution of sulfuric acid of ve rcent., for example, which will free them from all the salts that theystill contain. Finally they are rinsed in water and dried. It should benoted that the result would not be attained if 5 i this treatment wereapplied after a prelimina l; of the threads on leaving the am -batHaving now described my invention, what I claim as new, and desire tosecure by Lotters Patent, is- I a 1. A process for the manufacture oflustrous threads of'cellulose by means of a cupro-ammoniacal solution ofcellulose, consisting in extract' a rtion of the ammonia contained insai so ution and then causing the latter to pass in-the form of a vefine 'et into a very dilute acid and then into a soution of amercerizinlg alkali.

e manufacture of lus- 6o 2. A process for t trous threads of celluloseby means of a eupro-arnmoniacal solution of cellulose, consistmg inextracting a portion of the ammonia contained in said solution, in thencausing the latter to pass-in the form of a very fine jet into asolution of sulfuric acid at about two to fifteen per cent. and thandirectly into asolution of hydrate of soda. v

In testimony whereof I have afixed my signature in presence of twosubscribing wit-- 7e nessesr r RUDLINKMEYER.

Witnesses:

H. J. E. Kmxiwrmox. L. Pmaann.

